Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
SYSTEMS AND METHODS FOR ACQUIRING AND MOVING OBJECTS
BACKGROUND
The invention generally relates to programmable motion systems and relates in
particular to
end effectors for programmable motion devices (i.e., robotic systems) for use
in object processing
such as object sortation.
End effectors for robotic systems, for example, may be employed in certain
applications to
select and grasp an object, and then move the acquired object very quickly to
a new location. End
effectors that are designed to very securely grasp an object during movement
may have limitations
regarding how quickly and easily they may select and grasp an object from a
jumble of dissimilar
objects. Conversely, end effectors that may quickly and easily grasp a
selected object from a
jumble of dissimilar objects may have limitations regarding how securely they
may grasp an
acquired object during rapid movement, particularly rapid acceleration and
deceleration (both
angular and linear).
Many end effectors employ vacuum pressure for acquiring and securing objects
for transport
or subsequent operations by articulated arms. Other techniques for acquiring
and securing objects
employ electrostatic attraction, magnetic attraction, needles for penetrating
objects such as fabrics,
fingers that squeeze an object, hooks that engage and lift a protruding
feature of an object, and
collets that expand in an opening of an object, among other techniques.
Typically, end effectors are
designed as a single tool, such as for example, a
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gripper, a welder, or a paint spray head, and the tool is typically designed
for a specific set of
needs.
There remains a need therefore, for an end effector in a programmable motion
system that
may select and grasp an object, and then move the acquired object very quickly
to a new location.
SUMMARY
In accordance with an embodiment, the invention provides an end effector
system for an
arm of a robotic system, the end effector system comprising: a primary gripper
system that includes
a gripper; and a secondary retention system including a suspended cup
proximate to the primary
gripper system such that the gripper is configured to acquire an object from a
plurality of objects
and drop the object into the suspended cup for transport to an output
destination.
In accordance with another embodiment, the invention provides a method of
engaging and
moving an object using a robotic system, the method comprising: acquiring the
object with a
gripper of a primary gripper system, the primary gripper system being attached
to an end effector
system for an arm of the robotic system; dropping the object from the gripper
into a suspended cup
of the secondary retention system, the secondary retention system also being
attached to the end
effector system; and moving the arm of the robotic system to transport the
object in the suspended
cup of the secondary retention system to an output destination by moving the
arm of the robotic
system.
BRIEF DESCRIPTION OF THE DRAWINGS
The following description may be further understood with reference to the
accompanying
drawings in which:
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Figure 1 shows an illustrative diagrammatic view of a system in accordance
with an
embodiment of the present invention;
Figure 2 shows an illustrative diagrammatic view of an end effector portion of
the system
of Figure 1;
Figures 3A ¨ 3C show illustrative diagrammatic sectional views of the end
effector portion
in accordance with an embodiment including a tubular annulus during
acquisition and retention of
an object;
Figures 4A ¨ 4D show illustrative diagrammatic sectional views of the end
effector portion
in accordance with another embodiment including a jamming gripper during
acquisition and
retention of an object;
Figures 5A ¨ 5C show illustrative diagrammatic sectional views of the end
effector portion
in accordance with a further embodiment including vacuum cups during
acquisition and retention
of an object;
Figures 6A ¨ 6D show illustrative diagrammatic sectional views of the end
effector portion
in accordance with a further embodiment including gripping retention actuators
during acquisition
and retention of an object;
Figures 7A and 7B show illustrative diagrammatic sectional views of the end
effector
portion in accordance with a further embodiment including a retention shroud
during acquisition
and retention of an object;
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Figures 8A and 8B show illustrative diagrammatic sectional views of the end
effector
portion in accordance with an embodiment including further gripping retention
actuators
during acquisition and retention of an object;
Figures 9A and 9B show illustrative diagrammatic sectional views of the end
effector
portion in accordance with an embodiment including a further arrangement of
vacuum cups
during acquisition and retention of an object;
Figures 10A and 10B show illustrative diagrammatic sectional views of the end
effector portion in accordance with an embodiment including retention
stabilizing pads
during acquisition and retention of an object;
Figure 11 shows an illustrative diagrammatic view of a system in accordance
with a
further embodiment of the present invention that includes a retention tray;
Figure 12A ¨ 12F show illustrative diagrammatic sectional views of the end
effector
portion in accordance with an embodiment including a retention tray during
acquisition,
retention and release of an object;
Figure 13 shows an illustrative diagrammatic view of a system in accordance
with a
further embodiment of the present invention that includes a retention support;
Figures 14A and 14B show illustrative diagrammatic sectional views of the end
effector portion in accordance with an embodiment including a retention
support during
acquisition, retention and release of an object;
Figure 15 shows an illustrative diagrammatic view of the end effector system
of
Figure 13 approaching a jumble of objects;
Figures 16A and 16B show illustrative diagrammatic sectional views of the end
effector portion in accordance with an embodiment of Figure 15 including a
retention support
during acquisition and retention of an object;
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Figure 17 shows an illustrative diagrammatic view of a system in accordance
with a
further embodiment of the present invention that includes multiple vacuum
cups;
Figures 18A, 18B and 18C show illustrative diagrammatic sectional views of the
end
effector portion in accordance with an embodiment including multiple vacuum
cups during
acquisition and retention of an object; and
Figures 19A and 19B show illustrative diagrammatic sectional views of the end
effector portion in accordance with a further embodiment of the present
invention employing
positive air pressure to create a vacuum at the end effector.
The drawings are shown for illustrative purposes only.
DETAILED DESCRIPTION
In accordance with various embodiments, the invention provides end effector
systems
that include two elements, one element for acquisition, and one element for
secure holding
during transportation. The acquisition element may be specialized to address
challenges of
acquisition, which may include perception of a desired object, separating the
object from
supporting or surrounding objects, and shifting the object to a position and
orientation suited
for transportation.
The secure holding element may be specialized to address challenges of
transportation, which may include security and stability during transport,
despite gravitational
forces, high speed acceleration, centrifugal forces, and contact with
surrounding objects.
Generally and in certain embodiments, the invention provides an end effector
system
for a robotic system, e.g., an articulated arm robotic system or any of a
delta, gantry,
spherical, SCARA, or cylindrical robotic systems. The end effector system
includes a
primary gripper system and a secondary retention system that substantially
surrounds at least
a portion of the primary Dipper system. In certain embodiments, at least a
portion of the
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primary gripper system may be drawn up within at least a portion of the
secondary retention
system such that the primary gripper system may be used to select an object
from a plurality
of objects, and the secondary retention system may be used to secure the
object for rapid
transport to an output destination.
More generally, and in accordance with a further embodiment, the invention
provides
a method of engaging and moving an object using a robotic system. The method
includes the
steps of engaging the object with a primary gripper system, moving the object
toward a
secondary retention system, retaining the object with the secondary retention
system, and
transporting the object to an output destination.
Figure 1 shows a robotic system 10 in accordance with embodiments of the
invention
that includes an articulated arm 12 on a base 14, and an end effector system
16 As further
shown in Figure 2, the end effector system may attach to the articulated arm
12 by way of an
engagement feature 18 (such as threads, spring-loaded clasp, or ball and
socket engagement)
that mate with an engagement feature on the articulated arm 12, and further,
the end effector
system may include a primary gripper system including a gripper 22 on the end
of an
extender 20, as well as secondary retention system 24 as discussed in more
detail below. As
each of the acquisition element and the secure holding element may vary, and
many different
embodiments are possible. The gripper in each of the embodiments, for example,
may be any
of a vacuum gripper, an electrostatic gripper, or a magnetic gripper etc.
Figures 3A ¨ 3C diagrammatically show sectional views of an end effector
system 30
in accordance with an embodiment of the present invention that includes a
primary gripper
system including a gripper 32 on the end of an extender 34. The end effector
system 30 also
includes a secondary retention system including a flexible toroid 36,
The flexible toroid is a fluid-filled or powder filled (and optionally
elastic) flexible
membrane that is compressed and inverted as it is drawn into the center of the
supporting
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structure. Such a device is formed of a continuous sheet of fabric that is in
the form of a
torus, or an annulus that extends along the direction that extends through the
center of the
annulus.
As shown in Figure 3A, a portion of the outer surface of the flexible toroid
36 is
attached to the inner surface of the housing 38 as shown at 40, and a portion
of the inner
surface of the elastic toroid is attached to the extender at 41. The toroid is
able to move up
and down (by rolling) between the outer collar and the inner extender.
With reference to Figure 3B, the extender 34 may be moved in the direction as
indicated at A such that the vacuum gripper 32 engages an object to be grasped
42. By
supplying a vacuum source through the extender 34, the object may be engaged
As further
shown in Figure 3B, when the extender 34 is moved in the direction as
indicated at A, it
draws the inner surface of the elastic toroid with it, which causes one end of
the elastic toroid
to roll inward upon itself in direction A, while the opposing end of the
elastic toroid will roll
outward. While the elastic toroid 36 undergoes this process of everting, it
remains attached
to the housing 38 at the attachment 40.
As shown in Figure 3C, when the engaged object is pulled into the elastic
toroid, the
object is securely engaged for transport or other processing operations. By
controlling the
movement of the elastic toroid as described above, the end effector may be
used to draw the
object 42 into the elastic toroid and hold it within the elastic toroid until
the linear actuator is
moved in a direction that is opposite the direction indicated at A (and the
object 42 is
discharged). The elastic toroid is formed of a flexible material that may
conform to the shape
of the object 42 being grasped. The fluid (or powder) within the elastic
toroid may be water
(or plastic particles) or may be selected to have a particular viscosity.
As shown in Figures 4A ¨ 4C (which show diagrammatic sectional views), an end
effector system 50 in accordance with another embodiment of the present
invention includes
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a primary gripper system including a gripper 54 on the end of an extender 52.
The end effector
system 50 also includes a secondary retention system including a jamming
gripper 56 having one or
more vacuum attachment ports 58. Generally, the jamming gripper encloses a
fluid or volume of
particles having a very small size (e.g., powder) such that when a vacuum
source is provided to the
ports 58, the jamming gripper 56 reduces its volume and grabs any object
within its outer edge. The
jamming gripper 56 is also attached to the interior of the housing 60 as shown
at 62.
As shown in Figure 413, the extender 52 may be extended, permitting the
gripper 54 to
engage an object 64, and as shown in Figure 4C, when the object is drawn up
near or into the
jamming gripper 56, the jamming gripper engages at least a portion of the
outer surface of the
object 64. As shown in Figure 4D, when the vacuum source is applied to the
jamming gripper 56,
the gripper 56 conforms to the surface of the object 64, thereby securing the
object 56 for transport
or other processing operations.
In each of the embodiments of Figure 3A ¨ 4D, the secondary retention system
may have
difficulty engaging an object from an input area, but when combined with the
primary gripper
system, the end effector systems may acquire an object and subsequently
securely retain the object,
even when the end effector system undergoes rapid linear and angular
acceleration or deceleration.
As shown in Figures 5A ¨ 5C (which show diagrammatic sectional views), an end
effector system
70 in accordance with another embodiment of the present invention includes a
primary gripper
system including a gripper 72 on the end of an extender 74. The gripper 72 may
be any of a
vacuum gripper, an electrostatic gripper, or a magnetic gripper etc. The end
effector system 70
also includes a secondary retention system including a large area gripper 76
(e.g., a vacuum gripper,
an electrostatic gripper, or a magnetic gripper etc.) that surrounds the
extender 74. As shown in
Figure 5B, when the gripper 72 is extended into a cluttered
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environment (including, e.g., objects 80, 82, 84), the gripper 72 may engage
an object 82, and
draw the object toward the large area gripper 76, which then surrounds the
gripper 72. The
large area gripper 76 is then employed during rapid transport or further
processing operations.
Figures 6A ¨ 6D show a diagrammatic sectional view of an end effector system
90 in
accordance with another embodiment of the present invention, which includes a
primary
gripper system including a gripper 92 on the end of an extender 94. The
gripper 92 may be
any of a vacuum gripper, an electrostatic gripper, or a magnetic gripper etc.
The end effector
system 90 also includes a secondary retention system including two or more
constricting
actuators 96 (e.g., pinch grippers), that may be rotated with respect to pivot
locations 98 such
that a portion of each actuator 96 may engage a portion of an object to
thereby secure the
object.
In particular, as shown in Figure 6B, the actuator 92 may be extended to
engage an
object such as a bag 100 that includes loose items 102. As shown in Figures 6C
and 6D, the
bag 100 may be acquired by the gripper 92, and the constricting actuators 96
may then be
rotated to secure the bag 100 within the end effector system 90.
Figures 7A and 7B show an end effector 110 in accordance with another
embodiment
of the invention that includes a first portion 112 having a vacuum cup that
may be actuated to
engage an object 114, and then may withdraw the grasped object within a second
portion 116
in the form of a shroud. in various embodiments, the first portion 112 may
move toward the
object while the shroud 116 remains fixed, or in other embodiments, the first
portion may be
fixed, and the shroud 116 may be actuated to move toward the object 114 once
grasped.
Figures 8A and 8B show an end effector 120 in accordance with a further
embodiment of the invention that includes a first portion 122 having a vacuum
cup that may
be actuated to engage an object 124, and then may withdraw the grasped object
124. A
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second portion 126 that includes two or more paddles 128 then move radially
inward as shown at A
to secure the grasped object 124.
Figures 9A and 9B show an end effector 130 in accordance with a further
embodiment of
the invention that includes a first portion 132 having a vacuum cup that may
be actuated to engage
an object 134. The object 134 is then withdrawn toward a second portion 136
that includes one or
more additional vacuum cups 138 (three are shown) to secure the object 134
during transport. In
accordance with further embodiments, the first portion 132 may be fixed with
respect to an
articulated aim, and the second portion 136 may be lowered onto the object
134.
Figures 10A and 10B show an end effector 140 in accordance with a further
embodiment of
the invention that includes a first portion 142 having a vacuum cup that may
be actuated to engage
an object 144. The object 144 is then withdrawn toward a second portion 146
that includes one or
more compliant pads 148 to secure the object 144 during transport. In
accordance with further
embodiments, the first portion 142 may be fixed with respect to an articulated
arm, and the second
portion 146 may be lowered onto the object 144.
Figure 11 shows a robotic system 210 in accordance with further embodiments of
the
invention that includes an articulated arm 212 on a base 214, and an end
effector system 216. The
end effector system may include a primary gripper system including a gripper
222 on the end of an
extender 220, as well as secondary retention system 224 as discussed in more
detail below with
reference to Figures 12A ¨ 12F. As each of the acquisition element and the
transportation element
may vary, many different embodiments are possible. The gripper in each of the
embodiments, for
example, may be any of a vacuum gripper, an electrostatic gripper, or a
magnetic gripper etc.
Figures 12A ¨ 12F diagrammatically show views of the end effector system 216
in
accordance with an embodiment of the present invention that includes a primary
gripper system
including the gripper 222 on the end of the extender 220. The secondary
retention system 224
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includes a suspended cup 226 that may be mounted on an actuated member 228
such that the
suspension point of the cup 226 may be moved relative to the base of the end
effector system 216.
As shown in Figures 12A and 12B, the gripper 222 may engage and acquire an
object 230,
and bring the object 230 toward the suspended cup 226. As shown in Figures 12C
and 12D, the end
effector 216 may then be rotated, causing the suspended cup to move below the
object 230. As
shown in Figure 12E, the object 230 may then be dropped into the suspended cup
226. The robotic
system may, in certain applications, acquire and place many such objects into
a cup prior to
transport. Following transport to an output destination, in certain
embodiments, the cup 226 may
include a releasable bottom 232 that may be actuated to drop the one or more
objects into the output
destination.
Figure 13 shows a system 250 that includes an articulated arm 252 on a base
254 as well as
an end effector portion 256. The end effector portion 256 includes a primary
acquisition portion
258 and a secondary retention system 260. As further shown in Figures 14A and
14B, the primary
acquisition system includes a vacuum cup on an actuator shaft 264 that passes
through an actuatable
magnetic coil within arm 266. The secondary retention system 260 includes a
tray for supporting
the object 262 once grasped as shown in Figure 14B. As shown in Figure 15,
such an end effector
portion 256 may also be employed to selectively pull one object (e.g., 270)
from a mix of objects
272. As shown in Figures 16A and 16B, the primary acquisition system 258 may
acquire the object
270, and the secondary retention system may then support the retained object
270.
In accordance with further embodiments, and as shown in Figure 17, a system
300 of the invention
may provide an end effector system that includes a primary acquisition system
302 and a secondary
retention system 304, each of which includes a vacuum cup and a pivot
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joint. When the primary acquisition system 302 engages an object 306 (as shown
in Figure
18A), the end effector then rotates (as shown in Figure 18B) such that the
secondary retention
system 304 also grasp the object 306 so that it may then be lifted and moved
(as shown in
Figure 18C).
Again, the gripper attached to the programmable motion extender in each of the
embodiments may be any of a vacuum gripper, an electrostatic gripper, or a
magnetic gripper
etc. In other embodiments, both the primary gripper system and the secondary
retention
system may involve a wide variety of acquisition and retention systems. For
example, in
accordance with further embodiments, any of the above disclosed systems may be
provided
with a vacuum source at the end effector wherein the vacuum is provided by a
Venturi
opening at the end effector. Figures 19A and 19B show an example of a primary
retention
system 310 (that may be used with any of the above discussed embodiments), and
includes a
conduit 314 for selectively providing air at positive pressure to an end
effector 318. The
conduit (which is provided within a second retention system 312 as discussed
above),
includes an area of restricted diameter 316 as well as a Venturi opening 320.
When positive
air pressure is provided (as shown in Figure 19B), the air blows out the end
of the conduit
and produces a vacuum source at the opening 320, thereby permitting the end
effector 318 to
acquire an object 322. Again, such a positive air pressure and Venturi system
for providing
the vacuum, may be used with each of the above embodiments.
Those skilled in the art will appreciate that numerous modifications and
variations
may be made to the above disclosed embodiments without departing from the
spirit and scope
of the present invention.
What is claimed is:
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